Harvia 39" Black Steel Sauna Wood Stove Chimney ExtensionThe Harvia WHP1000M steel chimney extension made of black powder coated steel enables you to easily extend your Harvia steel chimney. Thanks to an ingenious joint mechanism, the supplementary parts are wound together and the smoke pipes are locked in place by the grooves on them. This prevents movement caused by temperature changes. Indoors, the chimney can be installed up to a height of 3 meters without support. Outdoors, the corresponding self